SBG-PID

[scs]

And the darlington transistor is old.. .Aber arbeitet sehr gut!

[bernte_one]

lf357 is obsolet, why did all engineers here continue drawing design with lf357
i got a handful of fake lf357 from ali, just for testing - but they are crap

[6666]

Hi 6666,
I drew it in altium designer.

[wallker]

Hi 6666,
I drew it in altium designer.

[6666]

Walker what did you draw that in, it was fast.

[wallker]

The resistors R43 and R51 are selected according to the meter

That's why I put a trimmer there, as I wrote in a post.

Only the two resistors R43 and R51 are changed with trimmer, rest is original.

There was indeed error at c11 and c12, it's just hard to read your sch. (red is how I would done it, black circle is how you done it)
Anyway tnx you for noticing, I've changed that now.
I'm looking forward to eliminate all the errors that exists on schematic.
Version with corrected caps: SBG-PID.pdf

[scs]

You have mistakes. I have not checked everything, I do not have time.

[wallker]

Schematic

Okay, so I think it's in the spirit of better understanding among us, time to publish a schematic that is easier to follow than the original one.
One warning, it may contain errors, I didn't double check it, so I hope that some of you can help with that.
Also the schematic is drawn on several sheets, and when joining a single page layout it didn't came out perfect, but I think is still easier to follow, later it will be improved.
Only the two resistors R43 and R51 are changed with trimmer, rest is original.
SBG-PID.pdf

[scs]

That is right. Operational amplifiers in one corpus have mutual influence. The diagram shows which are in one corpus .3 pieces TL062.

[dbanner]

I think he saying don't use quad opamp, not good because they can be prone to oscillations in this circuit. Better to use dual. Two opamp in same body( corpus) which two is important depending on which part of circuit they are from. That's why I suppose he relabel.

[wallker]

I don't understand what u trying to say.
Should we use more than 3 x TL064?

[scs]

It is not good to be in 4 OP a corps. This is a crystal and they have an impact when amplifying more than 1.

[wallker]

I understand that all op amps are double, except LF357.
Only error that i did spotted was at LF 357, pin 1 and pin 6 are now swapped.
But i don't see nothing different at op2.

I just spotted now that you relabeled OP5 TO OP4.

[scs]

The error occurred because of the automatic numbering in the schema program.All op are double, type m0062. Is not only double op3, type lf 357. It is important who is in a who corpus. See the last diagram. Is correct.

[dbanner]

Yes OP1 is single Opamp, output on pin 6. I see nothing wrong with OP2.
The operation of the "set meter" trim, to set needle to center position?